JPH02107350A - Wet type vertical crusher - Google Patents

Abstract

PURPOSE:To prepare an excellent product composed of an ultrafine powder having narrow particle size distribution and a uniform particle size by performing wet crushing using rollers before mainly performing crushing due to grinding under high pressure. CONSTITUTION:A rotary cylinder 5 having a classifying truncated cone 6 provided to the upper end part thereof is provided to a turntable 2 so as to be erected on the upper outer peripheral surface thereof and a plurality of crushing rollers 3 are pivotally supported in a freely rotatable manner by the cylindrical column 9 vertically suspended downwardly on the center axis of a vertical crusher. A hydraulic cylinder 12 for bringing the crushing rollers 3 into contact with the upper surface of the turntable 2 under pressure through the boom 10 branched from the upper end part of the column 9 horizontally or almost horizontally to extend to the outside of a casing 1 is arranged outside the casing 1. Further, the distribution inner cylinder 7 suspended in the rotary cylinder 5 from the boom 10 is provided and a chute 15 for throwing an object to be crushed and a liquid in the casing 1 is arranged so as to pierce through the column 9. A discharge port 14 for discharging the slurry flooding from the upper end of the rotary cylinder 5 to the outside of the casing 1 is provided to the casing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wet vertical pulverizer which introduces a material to be pulverized together with a liquid into a casing and pulverizes it.

[Prior Art] Ball mills and rod mills are conventionally known as wet crushers. Further, a grinding type mill (pole stirring mill) is also known. However, such conventional wet pulverizers have problems such as poor pulverization efficiency or difficulty in increasing their size.

On the other hand, as a dry pulverizer, a vertical pulverizer that is efficient and can be large-sized is known. This vertical crusher.

Grinding is performed by pressing rollers onto a rotating table and rotating the rotating table, and the pulverized material is dried and transported by hot gas introduced into the grinder from the outer periphery of the table.

[Problems to be solved by the invention] As mentioned above, in the conventional wet crusher, for example,
In ball mills and S' mills, materials are crushed by impact or friction using multiple poles using centrifugal force or falling blades, but the force of each pole is small, and the total weight of the poles does not contribute to crushing, so the crushing efficiency is low. bad. Furthermore, since the poles are used as the grinding medium, it is unsuitable for high-concentration grinding, that is, high-viscosity grinding.

In addition, if a conventional dry type vertical crusher is used as is for wet crushing, the rate of material biting into the rollers is poor, and a large amount of material-sized particles are ejected from the table, making it necessary to feed these particles to the rollers again. The pulverization efficiency was poor and it was unsuitable for fine pulverization.

[Means for Solving the Problems] The wet vertical crusher of the present invention includes a rotary table, a plurality of crushing rollers disposed on the rotary table, and a rotating table for rotating the plurality of crushing rollers. In a wet vertical crusher, the rotary table is rotatably supported, and includes a biasing means for pressing the crushing roller into contact with the upper surface of the rotary table via a connecting member, and introduces the material to be crushed and a liquid into a casing. Equipped with a rotating cylinder that stands upright on the upper surface of the outer periphery and is equipped with a truncated cone-shaped classification cone at the upper end, multiple crushing rollers are rotated in a column that hangs vertically downward on the central axis of the vertical crusher. A hydraulic cylinder is installed outside the casing to press the crushing roller against the l-plane of the rotary table via a boom that is freely pivoted and branched horizontally or substantially horizontally from the upper end of the column and extends outside the casing. , a rectifying inner cylinder extending from the boom to the inside of the rotating cylinder is provided, and a chute for introducing the material to be crushed and liquid passing through the column is provided, and the slurry overflowing from the upper end of the rotating cylinder is removed from the casing. It is equipped with an outlet for discharging water to.

In the wet vertical crusher of the present invention, the material to be crushed is introduced into the casing from the chute that passes through the column along with the liquid, and is passed through the rotary table, the rotary table, the column and the boom. The powder is pressed by the urging force of the hydraulic cylinder and is caught between the grinding roller that rotates as a result, and grinding is performed. The material to be crushed, which has reached a predetermined particle size, becomes a liquid-containing slurry, overflows from the upper end of the rotary cylinder installed on the outer periphery of the rotary table, and is discharged from the machine through the discharge port. .

[Example code] Hereinafter, embodiments will be described in detail with reference to the drawings.

1 to 5 show a wet vertical crusher according to an embodiment of the present invention, FIG. 1(a) is an overall vertical sectional view, and FIG. FIG. 2 is an enlarged sectional view of main parts, FIG. 3 is a perspective view of the boom, and FIG. 4 is an explanatory diagram of a flow model. FIG. 5 is a viscosity distribution diagram showing an example of the present invention in comparison with a conventional example.

A rotary table 2 is installed in the center of the interior of the casing 1 so as to be rotated around a vertical axis via a variable speed reducer 4 by a motor (not shown). On the other hand, multiple (in this example, 3
The crushing rollers 3 are rotatably supported on crushing roller bearings 3a. This crushing roller bearing 3a includes a column 9 that extends vertically upward, and a boom 10 that is connected to the upper end of the column and branches horizontally or approximately in the shape of a trunk and penetrates the casing 1.
A connecting body 1 connected to three sets of hydraulic cylinders 12 via
1, they are connected to be able to reciprocate in the vertical direction.

Therefore, it goes without saying that the casing through-hole of the boom 10 is an elongated hole. Figure 3 shows a perspective view of the boom. Further, a rotary cylinder is erected on the rotary table 2 over almost the entire outer circumference of the rotary table 2 by tightening means such as bolts. This rotary cylinder 5 may have a right cylindrical shape, and as shown in FIGS. 1 and 2, the three parts of the truncated inverted conical part 9, the cylindrical part, and the truncated conical part are connected from the bottom to the top. They may be configured together. In addition, the truncated inverted conical part and the truncated circle 1
It may be composed of two parts. However, regardless of the shape, a truncated cone-shaped classification cone 6 is disposed at the upper end of the rotary cylinder.

On the other hand, a cylindrical rectifying cylinder 7 is provided hanging down so as to enter inside the rotating cylinder 5 up to the height of the upper half of the rotating cylinder 5 from the boom lO. and a truncated inverted conical portion 5 at the lower end of the rotating cylinder.
A concentric truncated cone-shaped return cone 8 is fixed to the upper part of the inner conical surface of a at a distance of about 10 mm by a plurality of supports 8a bent and suspended from the casing l.

In addition, a plurality of rectifying blades 8b are provided at the lower end of the return cone 8.
are provided so as to protrude radially. In addition, when the one-rotation tube is a right cylindrical type and the lower end is cylindrical rather than a truncated inverted cone, the return cone 8 is also approximately 10 mm fl: (approximately 20 mm in diameter).
) with concentric cylindrical shapes. Inside the casing 1, near the side or lower side of the rotary table 1, there is a rotary cylinder 5.
A flow path and a discharge port 14 are provided for recovering the slurry overflowing the classification cone 6 at the upper end of the casing and discharging it to the outside of the casing.

Reference numeral 15 is a supply chute for supplying the material to be crushed and liquid.

It is supported and fixed to the casing 1.

The operation and function of the wet vertical crusher of the present invention configured as above will be explained.

First, the electric motor is started to rotate the rotary table 2 via the variable speed reduction a4, and at the same time, a mixture of the material to be crushed and a liquid (hereinafter referred to as raw material) is introduced from the supply chute 15. In addition, pressure oil is supplied to the hydraulic cylinder 12 supported by a pin on a frame 13 outside the casing, and the connecting rod 11. The crushing roller 3 is pressed against the upper surface of the rotary table with a predetermined force via the boom 10 and the column 9. This pressure contact force is determined by the crushing properties of the raw material.

It can be arbitrarily varied in consideration of the processing amount and the product particle size after pulverization.

The behavior of the raw material in the steady operating state as described above will be explained next.

The raw material of New Feed, which is fed into the vicinity of the center of the crusher by the chute 15, is sequentially passed through the crushing roller 3 and the rotary table 2.
The pulverizer is pressed against the pulverizer, receives compression and grinding action, and flows spirally from the center to the outer periphery of the pulverizer due to the centrifugal action caused by the rotation of the one-turn table 2.

To explain this with reference to the explanatory diagram of the flow model shown in FIG. (arrow A) L, the coarse particles having a relatively large particle size are immediately guided again through the path shown by arrow C between the crushing roller and the rotary table and are crushed. On the other hand, medium particles and fine particles other than these coarse particles rise as they are along the inner circumferential surface of the rotating cylinder and eventually reach the inner surface of the classification cone 6. Here, each particle suspended in the liquid is uniformly subjected to centrifugal force, but the centrifugal force depends on the mass, that is, the particle size (D
) to the third power (D
2), large-diameter particles are largely distributed on the inner peripheral wall surface of the classification cone. As shown in Fig. 4, the medium particles in contact with the inner circumferential wall face are horizontally subjected to centrifugal force H due to fluid rotation, while the component R perpendicular to the inner wall receives an equal force R in the opposite direction from the inner wall. are canceled out, and eventually the receiver descends due to the downward force along the inner wall surface shown in the figure, and heads toward the crushing roller again along the same path as the coarse particles along the path shown by arrow C.

In this way, coarse particles and medium particles gradually change into fine particles by being crushed again, but the fine particles have a weaker downward flow action as shown by the arrow in the vicinity of the classification cone than coarse particles and medium particles, and do not settle. , as the volume of the rotary cylinder 5 increases due to the new feed raw materials that are successively introduced, the classification cone 6 increases.
It becomes a slurry and overflows from the upper end, so W! Only the particles are discharged outside the casing.

In the above series of particle behaviors (flow and classification),
The function of the rectifying cylinder 7 will be explained. Due to the rotation of the rotary table, the raw material (liquid containing the material to be crushed) in the rotary cylinder behaves in the direction of rotation of the rotary table, for example, with a clockwise swirling flow and a combination of the above-mentioned vertical flow. There is. However, while the lower circumferential surface of the crushing roller moves in the direction of the rotary table (for example, in a clockwise direction), the upper end surface of the crushing port rotates in a counterclockwise direction, which is opposite to this direction. , which is in the opposite direction to the swirling flow of the raw material and has the effect of stirring the liquid. Therefore, the classification action in the vicinity of the classification cone 6 described in FIG. 4 is significantly inhibited. In order to prevent this, the straightening cylinder 7 is suspended between the crushing roller 3 and the classification cone 6 in order to shut out the influence of this reverse rotation, that is, the stirring action.

In addition, the return cone 8 forms a path for guiding the crushed particles to the classification cone 6, and at the same time, the crushed particles adhere to the inner surface of the truncated inverted conical portion 5a at the lower end of the rotary cylinder 5 in the form of a cake. In other words, by providing the return cone 8 stationary with respect to the rotating a-head inverted conical portion 5a, it serves as a scraper to scrape off the cake that adheres to it. Moreover, the inner inclined surface also serves as a guide plate for the return of coarse particles, as described above. A plurality of rectifying blades 8b provided at the lower part of the return cone 8 and extending from the return cone 8 are for suppressing the swirling flow of the slurry and promoting the return of coarse particles (not shown by arrow C). Although the rectifying blade 8b was installed at an intermediate position between adjacent crushing rollers as shown in FIG. 1(b), it can be installed anywhere as long as it does not interfere with the crushing rollers. In addition,
Ultrafine particles can also be obtained by further classifying the product slurry discharged from the pulverizer according to the present invention using a classifier installed outside the pulverizer and recycling the coarse particles.

Particle size of fine particles obtained by pulverizing limestone (raw material particle size 20 mm or less) as a material to be crushed by the wet vertical pulverizer according to this example and by further classifying the limestone (raw material particle size 20 mm or less) by the same dry type vertical pulverizer using a classifier. As can be seen from Figure 0, a comparison diagram of the distribution is shown in Figure 5.

The embodiments of the present invention have a much smaller average particle size and a sharper particle size distribution than the conventional examples, and can perform M fine pulverization and pulverization with uniform grains.

Further, in the present invention, the crushing roller is provided with a column that hangs down from the central axis of the crusher, and a boom that connects the column.

The hydraulic cylinder is in pressure contact with the top surface of the rotary table, so the movement of the raw materials (liquid + materials to be crushed) swirling inside the rotary cylinder during operation can be ensured without any disturbance and smooth rotation, resulting in the classification effect in the classification cone. is excellent.

Furthermore, since the raw material chute passes through the column and is fed from the central axis of the crusher, it is evenly distributed to a plurality of crushing rollers, and as it rotates, it imparts disturbance to the flowing particles that are simultaneously classified. Good classification is carried out because there are few.

[Effects of the Invention] According to the present invention, since pulverization is carried out wetly and using rollers, pulverization is mainly carried out by grinding under high pressure.
There is little agglomeration after pulverization, and the particle classification effect in the liquid inside the pulverizer is excellent, so it is possible to obtain an excellent product with ultra-fine particles and uniform particles with a narrow particle size distribution.

In addition, traditional ceramic raw materials (limestone, cement raw materials).

coal, dolomite, etc.) as well as ceramics,
Even for new materials such as pigments and chemicals, it is possible to achieve ultrafine pulverization of submicron size or less, which was previously considered difficult.

It can also be used to treat milk of lime and various ores used in flue gas desulfurization, water treatment, etc. In addition, even in high concentration (high viscosity) mixed pulverization, it is possible to mix and pulverize without sticking to the container.
Mixed pulverization such as (coal/oil mixture) can be easily carried out.

In addition, since it is a wet type and performs roller grinding, the power consumption of the grinder is approximately 50% or less compared to conventional grinders such as pole stirring mills, and power consumption can be significantly reduced.

In the present invention, the shaft support of the crushing roller and the means for pressing against the top surface of the rotary table are connected to the hydraulic cylinder via the column and boom that hang down over the central axis of the crusher, so there is no need to contact the rectifying cylinder or the rotating cylinder. Since it can be provided independently without interference and does not inhibit the classification action of the flowing pulverized particles in the slightest, excellent pulverization and classification effects can be obtained.

In addition, since the chute is provided hanging down from the center axis of the crusher, the new raw material falls without causing any disturbance to the rotating raw material, so the distribution to the multiple crushing rollers is even, and Since the classification effect is not adversely affected, it is possible to provide a pulverizer with high pulverization efficiency and excellent classification effect.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 to 4 show embodiments according to the present invention, and FIG.
a) is an overall vertical cross-sectional view, and FIG. 1(b) is a general longitudinal sectional view.
FIG. 2 is an enlarged cross-sectional view of the main part, FIG. 3 is an enlarged cross-sectional view of the main part showing another embodiment of the rotary cylinder, and FIG. 4 is an explanatory diagram of a flow model. FIG. 5 is a particle size distribution diagram in an example of the present invention and a conventional example. 1...Casing, 2...Rotary table, 3...Crushing roller, 3a...
・Crushing roller bearing, 4...Reducer,
5... Rotating tube, 6... Classifying cone,
7... Rectifying cylinder, 8... Return cone, 8a... Support, 8b... Rectifying vane,
9...Column, 10...Boom, 11...Connecting rod, 12...
・Hydraulic cylinder, 13... Frame, 14...
...Discharge port, 15...Chute. Patent applicant Ube Industries Co., Ltd.

Claims (1)

[Claims] (1) A rotary table, a plurality of crushing rollers arranged on the rotary table, and a plurality of crushing rollers are rotatably supported in the casing, and the crushing rollers are rotated via a connecting member. In a wet vertical crusher that is equipped with a biasing means that presses against the top surface of the table and introduces the material to be crushed and liquid into the casing, the rotary table is erected on the top surface of the outer periphery and has a truncated conical shape on the top end. A rotary cylinder equipped with a classification cone is provided, and a plurality of crushing rollers are rotatably supported on a cylindrical column that hangs vertically downward on the central axis of the vertical crusher. A hydraulic cylinder is installed outside the casing to press the crushing roller against the top surface of the rotating table via a boom that branches out substantially horizontally and extends outside the casing, and a rectifying inner cylinder that hangs down from the boom into the rotating cylinder. Wet vertical crushing, characterized in that it is equipped with a chute for introducing the material to be crushed and liquid that passes through the column, and an outlet for discharging slurry overflowing from the upper end of the rotating cylinder to the outside of the casing. Machine.